TryToGetDC.c

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/*-----------------------------------------------------------------------------------*/ 
/* CORNET Allan */
/* INRIA 2006 */
/*-----------------------------------------------------------------------------------*/ 
#include <Windows.h>
/*-----------------------------------------------------------------------------------*/ 
#define MSG_ERROR20 "ERROR"
#define MSG_ERROR36 "Error : GetDC fails"
#define MSG_ERROR37 "Error : GetDC Input don't handle NULL"
/*-----------------------------------------------------------------------------------*/ 
HDC TryToGetDC(HWND hWnd)
{
        HDC hDCRet=NULL;

        if (hWnd)
        {
                hDCRet=GetDC(hWnd);
                if (hDCRet == NULL)
                {
#ifdef _DEBUG
                        MessageBox(NULL,MSG_ERROR36,MSG_ERROR20,MB_ICONWARNING);
#endif
                }
        }
        else
        {
#ifdef _DEBUG
                MessageBox(NULL,MSG_ERROR37,MSG_ERROR20,MB_ICONWARNING);
#endif
        }

        return (HDC)hDCRet;
}
/*-----------------------------------------------------------------------------------*/ 

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